/**
 * Copyright ©2012-2018 HopeHaiyang Corporation, All Rights Reserved
 * http://www.wuhanhope.com
 */
package hope.platform.data.utils;

/**
 * class info
 *
 * @author hujia
 *         Create at 2018/7/11 16:18
 */
public final class DistanceUtils {
    public static double TwoPointByLatitudeAndLongitude(double longitude1, double latitude1,
                                                        double longitude2, double latitude2) {
        double Lat1 = rad(latitude1); // 纬度

        double Lat2 = rad(latitude2);

        double a = Lat1 - Lat2;//两点纬度之差

        double b = rad(longitude1) - rad(longitude2); //经度之差

        //计算两点距离的公式
        double s = 2 * Math.asin(Math

                .sqrt(Math.pow(Math.sin(a / 2), 2) + Math.cos(Lat1) * Math.cos(Lat2) * Math.pow(Math.sin(b / 2), 2)));

        s = s * 6378137.0;//弧长乘地球半径（半径为米）

        s = Math.round(s * 10000d) / 10000d;//精确距离的数值

        return s;
    }

    //角度转换成弧度
    private static double rad(double d) {

        return d * Math.PI / 180.00;

    }
}
